ALL_TAB_PRIVS

Grants on objects for which the user is the grantor grantee owner or an enabled role or PUBLIC is the grantee

Columns
___________________________
GRANTOR
Name of the user who performed the grant
GRANTEE
Name of the user to whom access was granted
TABLE_SCHEMA
Schema of the object
TABLE_NAME
Name of the object
PRIVILEGE
Table Privilege
GRANTABLE
Privilege is grantable
HIERARCHY
Privilege is with hierarchy option